Short-Time Delay; Trip Unit Display For Short-Time Pickup Coupled With Long-Time Pickup; Time-Current Curve Illustrating Short-Time Pickup; Trip Unit Display For Short-Time Delay - GE MicroVersaTrip Plus User Manual

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Figure 14. Trip Unit display for short-time pickup coupled with
long-time pickup.
The time-current curve for short-time pickup is
shown in Figure 15.
Figure 15. Time-current curve illustrating short-time pickup.

Short-Time Delay

The Trip Unit display for short-time delay is shown
in Figure 16. This function delays the breaker trip on
a short-time trip. The choices of time-delay bands
are listed in Table 12. The delay with
current of 600% of xLT at the lower limit of the
band. The delay with
each band.
On ANSI Trip Units ordered with the user-selectable,
switchable instantaneous overcurrent and ground-
fault option, "X," an additional value of
at the end of the delay band settings. Choosing
disables short-time protection. The short-time
band is interlocked with instantaneous pickup, so
that only one function can be turned off at a time.

I 2 T OUT

The function, illustrated in Figure 17, estab-
lishes a constant time delay.
with a constant slope, as shown in Figure 18.

I 2 T IN

I 2 T OUT

is for the lower limit of
OFF
I 2 T IN
biases the delay
Figure 16. Trip Unit display for short-time delay.
Table 12. Lower-limit delays for
Figure 17. Time-current curve for short-time delay with
is for a
appears
OFF
OFF
Figure 18. Time-current curve for short-time delay with
17
Chapter 2. Setup Mode
B B B B a a a a n n n n d d d d T T T T i i i i m m m m e e e e D D D D e e e e l l l l a a a a y y y y s s s s , , , , s s s s e e e e c c c c
1 0.10
2 0.21
3 0.35
I 2 T OUT
short-time delay bands.
I 2 T OUT
.
I 2 T IN
.